CN109494815A - A kind of multi-objective coordinated control method of Distributed Power Flow controller - Google Patents
A kind of multi-objective coordinated control method of Distributed Power Flow controller Download PDFInfo
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- CN109494815A CN109494815A CN201811570354.4A CN201811570354A CN109494815A CN 109494815 A CN109494815 A CN 109494815A CN 201811570354 A CN201811570354 A CN 201811570354A CN 109494815 A CN109494815 A CN 109494815A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
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Abstract
A kind of multi-objective coordinated control method of Distributed Power Flow controller, this method is first established with route active power flow, route reactive power trend, route head end busbar voltage, series side DC capacitor voltage, DC capacitor voltage between two current transformer of side in parallel is control variable, the integral of the variance of reference value is set as the multi-objective coordinated Controlling model of Distributed Power Flow controller of performance indicator formation objective function using the above-mentioned its corresponding controller of control variable, again the control parameter of Distributed Power Flow controller will be obtained in the parameter input multi-objective coordinated Controlling model of Distributed Power Flow controller of element each on route, then coordinated control is carried out to Distributed Power Flow controller according to control parameter.The design significantly improves the performance of Distributed Power Flow controller.
Description
Technical field
The invention belongs to smart grid operations and stability control techniques field, and in particular to a kind of Distributed Power Flow controller
Multi-objective coordinated control method, to improve the task performance of Distributed Power Flow controller.
Background technique
Distributed Power Flow controller (Distributed Power Flow Controller, DPFC), which removes, has power tune
Section, regulating and controlling voltage inhibit power oscillation of power system, enhance outside the function of stability of power system, also there is degree of unbalancedness to mend
Repay, power quality controlling the features such as.DPFC parallel connection side 3-phase power converter is by transformer and systems exchange fundamental power, wherein having
Function power is to maintain the voltage of DC capacitor in target value, and reactive power is to control side bus voltage in parallel.Single-phase unsteady flow
Device transmits triple-frequency harmonics power to DPFC series side by transmission line of electricity, on the one hand series side current transformer absorbs side in parallel from system
The triple-frequency harmonics active power that current transformer comes through Transmission Lines is target value for maintaining DC capacitor voltage itself；
On the other hand, the needs regulated and controled according to system load flow inject amplitude and the adjustable fundamental voltage of phase angle, series-parallel side to system
Coordinative role, the common function of realizing DPFC regulating system trend.
The side in parallel of Distributed Power Flow controller has three-phase and single-phase converter, and series side more has up to up to a hundred lists
Phase current transformer, coupling interaction effect to each other will be extremely complex.Moreover, being embodied on power flowcontrol, DPFC has multiple controls
Target processed seeks the coordinated control between multiple target, is the weight that powerful, cheap DPFC moves towards that engineer application to be solved
Want one of problem.
Summary of the invention
Based on background above, the present invention provides the distributions that one kind can effectively improve Distributed Power Flow controller performance
The multi-objective coordinated control method of flow controller.
In order to achieve the above object, technical scheme is as follows:
A kind of multi-objective coordinated control method of Distributed Power Flow controller, successively the following steps are included:
Step A, the multi-objective coordinated Controlling model of Distributed Power Flow controller is established, wherein the Distributed Power Flow control
The objective function of the multi-objective coordinated Controlling model of device are as follows:
In above formula, D (δse) it is δseThe variance of corresponding controller setting reference value, δseFor route active power tide
Stream, VseFor route reactive power trend, VsFor route head end busbar voltage, VDc, seFor series side DC capacitor voltage, VDc, shFor
DC capacitor voltage between two current transformer of side in parallel, t is the time；
Step B, the parameter value of element each on route is first inputted into the multi-objective coordinated Controlling model of Distributed Power Flow controller
In, the control parameter of Distributed Power Flow controller is obtained, then Distributed Power Flow controller is coordinated according to control parameter
Control.
In step A,
In above formula, Kpk、KikThe respectively proportionality coefficient and integral coefficient of Distributed Power Flow controller, k=1,2,3,4,5,
S is VsePhase angle, PL、QLThe respectively active and reactive power flow of charged line, PL, ref、QL, refRespectively charged line it is active and
The reference value of reactive power flow, mshFor the modulation ratio of two current transformer of side in parallel, VS, refFor VsReference value, ISh1, d、ISh1, d, refPoint
Not Wei in parallel side fundamental current and its reference value d axis component, Ish3、ISh1, d, refSide current transformer respectively in parallel is issued to route
Triple harmonic current and its reference value.
In step A, the bound for objective function include energy balance constraint, voltage security operational limit constraint,
The constraint of device Power generation limits；
The energy balance constraint are as follows:
In above formula, PseThe active power of route, P are injected for series side current transformershIt is absorbed for side current transformer in parallel active
Power, P1For route head end active power, Pse1The fundamental power in route, P are injected for series side current transformerDc, se、PDc, shRespectively
For the active power on the DC capacitor of series and parallel side, Psh3The triple-frequency harmonics wattful power issued for side current transformer in parallel to route
Rate；
The voltage security operational limit constraint are as follows:
In above formula, Vsmin、VsmaxFor VsMinimum, maximum safe operation value, VsemaxFor VseThe maximum value of permission, mse1For
The modulation ratio of series side current transformer, VDc, se, maxFor the maximum value of DC capacitor voltage,It is series side current transformer to route
The maximum value of the third harmonic voltage of sending, ξ are that the safe operation of route allows maximum deflection difference value；
The constraint of described device Power generation limits are as follows:
Psemax+Qsemax=Sse
In above formula, Pse、QseThe respectively active power and reactive power of series side injection route, Psemax、QsmaxRespectively
Series side injects the active power maximum value and reactive power maximum value of route, SseFor the installed capacity of series side.
In step B, the control parameter includes the proportionality coefficient and integral coefficient of Distributed Power Flow controller.
Compared with prior art, the invention has the benefit that
A kind of multi-objective coordinated control method of Distributed Power Flow controller of the present invention is with route active power flow, route
DC capacitor electricity between reactive power trend, route head end busbar voltage, series side DC capacitor voltage, two current transformer of side in parallel
Pressure is control variable, and the above-mentioned its corresponding controller of control variable is set the integral of the variance of reference value as performance indicator shape
At objective function, and consider the multiple constraints such as energy balance constraint, the constraint of voltage security operational limit and the constraint of device Power generation limits
Condition constructs the multi-objective coordinated Controlling model of Distributed Power Flow controller, can solve Distributed Power Flow controller using the model
Reciprocal effect problem between more control targets, effective Optimum distribution formula flow controller significantly improve Distributed Power Flow controller
Performance, ensure Distributed Power Flow controller power effective performance.Therefore, the present invention significantly improves Distributed Power Flow
The performance of controller.
Detailed description of the invention
Fig. 1 is DPFC load flow regulation ability schematic diagram in the embodiment of the present invention 1.
Specific embodiment
The present invention will be further described in detail with reference to the specific embodiments.
A kind of multi-objective coordinated control method of Distributed Power Flow controller, successively the following steps are included:
Step A, the multi-objective coordinated Controlling model of Distributed Power Flow controller is established, wherein the Distributed Power Flow control
The objective function of the multi-objective coordinated Controlling model of device are as follows:
In above formula, D (δse) it is δseThe variance of corresponding controller setting reference value, δseFor route active power tide
Stream, VseFor route reactive power trend, VsFor route head end busbar voltage, VDc, seFor series side DC capacitor voltage, VDc, shFor
DC capacitor voltage between two current transformer of side in parallel, t is the time；
Step B, the parameter value of element each on route is first inputted into the multi-objective coordinated Controlling model of Distributed Power Flow controller
In, the control parameter of Distributed Power Flow controller is obtained, then Distributed Power Flow controller is coordinated according to control parameter
Control.
In step A,
In above formula, Kpk、KikThe respectively proportionality coefficient and integral coefficient of Distributed Power Flow controller, k=1,2,3,4,5,
S is VsePhase angle, PL、QLThe respectively active and reactive power flow of charged line, PL, ref、QL, refRespectively charged line it is active and
The reference value of reactive power flow, mshFor the modulation ratio of two current transformer of side in parallel, VS, refFor VsReference value, ISh1, d、ISh1, d, refPoint
Not Wei in parallel side fundamental current and its reference value d axis component, Ish3、ISh3, refSide current transformer respectively in parallel is issued to route
Triple harmonic current and its reference value.
In step A, the bound for objective function include energy balance constraint, voltage security operational limit constraint,
The constraint of device Power generation limits；
The energy balance constraint are as follows:
In above formula, PseThe active power of route, P are injected for series side current transformershIt is absorbed for side current transformer in parallel active
Power, P1For route head end active power, Pse1The fundamental power in route, P are injected for series side current transformerDc, se、PDc, shRespectively
For the active power on the DC capacitor of series and parallel side, Psh3The triple-frequency harmonics wattful power issued for side current transformer in parallel to route
Rate；
The voltage security operational limit constraint are as follows:
In above formula, Vsmin、VsmaxFor VsMinimum, maximum safe operation value, VsemaxFor VseThe maximum value of permission, mse1For
The modulation ratio of series side current transformer, VDc, se, maxFor the maximum value of DC capacitor voltage,It is series side current transformer to route
The maximum value of the third harmonic voltage of sending, ξ are that the safe operation of route allows maximum deflection difference value；
The constraint of described device Power generation limits are as follows:
Psemax+Qsemax=Sse
In above formula, Pse、QseThe respectively active power and reactive power of series side injection route, Psemax、QsemaxRespectively
Series side injects the active power maximum value and reactive power maximum value of route, SseFor the installed capacity of series side.
In step B, the control parameter includes the proportionality coefficient and integral coefficient of Distributed Power Flow controller.
Embodiment 1:
The present embodiment using equipped with two groups of series side Distributed Power Flow controllers one machine infinity bus system as object, it includes
Two-terminal generator G1 and G2, bus B1 and B2, double back transmission line L1 and L2, two sides transformer point is than being that Δ-Y and Y- Δ connect
Method, the parameter of each element on route are as follows: power generation end supply voltage is 0.38kV, and voltage phase angle is 8.7 °, and internal resistance is 1 Ω of resistance,
Inductance 0.1H；Receiving end supply voltage is 0.38kV, and voltage phase angle is 0 °；Two line impedances are 0.279+j3.99 Ω, transformation
Device no-load voltage ratio is 1:1；Line end is connected to the resistance that resistance is 0.5 Ω；Series-parallel DC capacitor voltage value is taken as 200V；Point
Cloth flow controller parallel connection side is mounted on the neutral conductor of generator and transformer T1, and two groups of series converters are mounted on route
On L1, and electrical distances are waited, i.e. resistance between two series converters is 0.1395+j1.995 Ω, the half for road total impedance that the line is busy.
A kind of multi-objective coordinated control method of Distributed Power Flow controller, this method successively follow the steps below:
Step 1 establishes the multi-objective coordinated Controlling model of Distributed Power Flow controller, wherein the Distributed Power Flow control
The objective function of the multi-objective coordinated Controlling model of device are as follows:
Psemax+Qsemax=Sse
In above formula, D (δse) it is δseThe variance of corresponding controller setting reference value, δseFor route active power tide
Stream, VseFor route reactive power trend, VsFor route head end busbar voltage, VDc, seFor series side DC capacitor voltage, VDc, shFor
DC capacitor voltage between two current transformer of side in parallel, t are time, Kpk、KikThe respectively proportionality coefficient of Distributed Power Flow controller
And integral coefficient, k=1,2,3,4,5, s VsePhase angle, PL、QLThe respectively active and reactive power flow of charged line, PL, ref、
QL, refThe respectively active reference value with reactive power flow of charged line, mshFor the modulation ratio of two current transformer of side in parallel, VS, refFor Vs
Reference value, ISh1, d、ISh1, d, refThe d axis component of side fundamental current and its reference value respectively in parallel, Ish3、ISh3, refRespectively
The triple harmonic current and its reference value that side current transformer in parallel is issued to route, PseThe active of route is injected for series side current transformer
Power, PshFor the active power that side current transformer in parallel absorbs, P1For route head end active power, Pse1For series side current transformer note
Enter the fundamental power in route, PDc, se、PDc, shActive power respectively on the DC capacitor of series and parallel side, Psh3For side in parallel
The triple-frequency harmonics active power that current transformer is issued to route, Vs min、Vs maxFor VsMinimum, maximum safe operation value, VsemaxFor
VseThe maximum value of permission, mse1For the modulation ratio of series side current transformer, VDc, se, maxFor the maximum value of DC capacitor voltage,For the maximum value for the third harmonic voltage that series side current transformer is issued to route, ξ is that the safe operation of route allows most
Large deviation value, Pse、QseThe respectively active power and reactive power of series side injection route, Psemax、QsemaxRespectively series side
Inject the active power maximum value and reactive power maximum value of route, SseFor the installed capacity of series side；
Step 2 inputs the parameter value of element each on route in the multi-objective coordinated Controlling model of Distributed Power Flow controller,
Obtain Vse(referring to Fig. 1, different ellipse representation series side fundamental voltages is not in figure for range between Line Flow ability of regulation and control
With DPFC load flow regulation ability corresponding under amplitude, the original tide that the same ellipse heart D (0.376,0.131) is system is corresponded to
Flow valuve, because last ability of regulation and control is in the region that A, B, O encircle a city in sectorial area by the constraint of DC capacitor voltage), it chooses
Crossover probability is 0.8, mutation probability 0.07, population scale 50, and largest optimization algebra is 50, and ABO shown in meter and Fig. 1 is fan-shaped
The constraint in region obtains the control parameter of Distributed Power Flow controller: Proportional coefficient Kp1=0.82, Kp2=0.45, Kp3=
0.62、Kp4=0.65, Kp5=0.56；Integral coefficient: Ki1=0.06, Ki2=0.03, Ki3=0.05, Ki4=0.05, Ki5=
0.04；
Step 3, the above-mentioned control parameter of input, Distributed Power Flow controller started starting when can obtain 4s, and (but series side is only
Put into first group), while route active power flow is set, 1kW is stepped to by initial trend；When 8s, second group of series side is put into
Current transformer, while route active power flow is set, 1.47kW is stepped to by 1kW；Two groups of series side current transformer DC capacitor voltages
It is constant to be set as 100V.When simulation comparison controller before and after Optimization about control parameter is not optimised, in 8s, first group of series converter
DC capacitor voltage from 0.5V transition to 1.8V, voltage fluctuation range 89%；The DC capacitor electricity of two groups of series converters
Pressure can maintain 0.2V or so, and voltage fluctuation reduces, and then put into second group of distribution flow controller series side, so that the
The injecting voltage of one group of series converter falls 5V or so；At this point, when second group of investment, first group of series converter voltage fluctuation
Only 0.5V, the injecting voltage of two series converters relatively optimize the preceding state that quickly tends to be steady.
It follows that each controller can be optimized using this Controlling model, to preferably improve Distributed Power Flow control
The performance of device.
Claims (4)
1. a kind of multi-objective coordinated control method of Distributed Power Flow controller, it is characterised in that:
The control method for coordinating successively the following steps are included:
Step A, the multi-objective coordinated Controlling model of Distributed Power Flow controller is established, wherein the Distributed Power Flow controller is more
The objective function of goal coordination Controlling model are as follows:
In above formula, D (δse) it is δseThe variance of corresponding controller setting reference value, δseFor route active power flow, Vse
For route reactive power trend, VsFor route head end busbar voltage, VDc, seFor series side DC capacitor voltage, VDc, shFor side in parallel
DC capacitor voltage between two current transformers, t are the time；
Step B, it is first obtained in the parameter value input multi-objective coordinated Controlling model of Distributed Power Flow controller of element each on route
To the control parameter of Distributed Power Flow controller, coordinated control is then carried out to Distributed Power Flow controller according to control parameter.
2. the multi-objective coordinated control method of Distributed Power Flow controller according to claim 1, it is characterised in that:
In step A,
In above formula, Kpk、KikThe respectively proportionality coefficient and integral coefficient of Distributed Power Flow controller, k=1,2,3,4,5, s are
VsePhase angle, PL、QLThe respectively active and reactive power flow of charged line, PL, ref、QL, refRespectively charged line is active and nothing
The reference value of function trend, mshFor the modulation ratio of two current transformer of side in parallel, VS, refFor VsReference value, ISh1, d、ISh1, d, refRespectively
For the d axis component of side fundamental current in parallel and its reference value, Ish3、ISh3, refWhat side current transformer respectively in parallel was issued to route
Triple harmonic current and its reference value.
3. the multi-objective coordinated control method of Distributed Power Flow controller according to claim 2, it is characterised in that:
In step A, the bound for objective function includes energy balance constraint, the constraint of voltage security operational limit, device
Power generation limits constraint；
The energy balance constraint are as follows:
In above formula, PseThe active power of route, P are injected for series side current transformershFor side current transformer in parallel absorb active power,
P1For route head end active power, Pse1The fundamental power in route, P are injected for series side current transformerDc, se、PDc, shRespectively go here and there,
Active power on side DC capacitor in parallel, Psh3The triple-frequency harmonics active power issued for side current transformer in parallel to route；
The voltage security operational limit constraint are as follows:
In above formula, Vsmin、VsmaxFor VsMinimum, maximum safe operation value, VsemaxFor VseThe maximum value of permission, mse1For series side
The modulation ratio of current transformer, VDc, se, maxFor the maximum value of DC capacitor voltage,It is issued for series side current transformer to route
The maximum value of third harmonic voltage, ξ are that the safe operation of route allows maximum deflection difference value；
The constraint of described device Power generation limits are as follows:
Psemax+Qsemax=Sse
In above formula, Pse、QseThe respectively active power and reactive power of series side injection route, Psemax、QsemaxRespectively connect
The active power maximum value and reactive power maximum value of route, S are injected in sideseFor the installed capacity of series side.
4. the multi-objective coordinated control method of Distributed Power Flow controller according to claim 1 or 2, it is characterised in that:
In step B, the control parameter includes the proportionality coefficient and integral coefficient of Distributed Power Flow controller.
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